Assertion : For a reaction AgBg

                                 re=2.5 PA            at 400K

                                 re=2.5 PA            at 600K

                  activation energy is 4135 J/mol.

Reason : Since for any reaction, values of rate constant at two different temp is same therefore

               activation energy of the reaction is zero.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Subtopic:  Arrhenius Equation |
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If concentration are measured in mole/litre and time in minutes , the unit for the rate constant of a 3rd order reaction are

(1) mol lit-1 min-1                                              

(2) lit2 mol-2min-1

(3) lit mol-1min-1                                              

(4) min-1

Subtopic:  Definition, Rate Constant, Rate Law |
 87%
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The following reaction was carried out at 300 K.

2SO2(g)  +  O2(g) →  2SO3(g)

The rate of formation of SO3 is related to the rate of disappearance of O2  by the following expression:

1. -O2t=+12SO3t                           

2. -O2t=SO3t

3. -O2t=-12SO3t                           

4. None of the above.

Subtopic:  Definition, Rate Constant, Rate Law |
 88%
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Which of the following rate laws has an over all order of 0.5 for the reaction A + B + C → product ?

1. R=k[A].[B].[C]                                            

2. R=k[A]0.5[B]0.5[C]0.5  

3. R=k[A]1.5[B]-1[C]0                                   

4. R=k[A][B]0[C]0.5

Subtopic:  Order, Molecularity and Mechanism |
 87%
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For the system A2g+B2g 2ABg,H=-80kJ If the activation energy for the forward step is 100 kcal/mol.What is the ratio of temperature at which the forward and backward reaction shows the same % change of rate constant per degree rise of temperature ? (1 cal= 4.2 J)

(A) 0.72                                                    

(B) 0.84

(C) 0.42                                                    

(D) 1

Subtopic:  Arrhenius Equation |
 64%
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For a reaction of the type 2A+B 2C, the rate of the reaction is given by kA2B. When the volume of the reaction vessel is reduced to 1/4 th of the original volume, the rate of reaction changes by a factor of

(A) 0.25                                                          

(B) 16

(C) 64                                                             

(D) 4

Subtopic:  Definition, Rate Constant, Rate Law | First Order Reaction Kinetics |
 75%
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From the following data , the orders with respect to A, B, C , respectively, are :

[A] (mol/L)  [B] (mol/L) [C] (mol/L) rate (M/sec.)
0.2 0.1 0.02 8.08 x 10-3
0.1 0.2 0.02 2.01 x 10-3
0.1 1.8 0.18 6.03 x 10-3
0.2 0.1 0.08 6.464 x 10-2


1. -1, 1, 3/2                                     

2. -1, 1, 1/2

3. 1, 3/2,-1                                     

4. 1,-1, 3/2

Subtopic:  Definition, Rate Constant, Rate Law |
 51%
From NCERT
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The elementary reaction A + B → products has k = 2 × 10-5 M-1 s-1 at a temperature of 27 °C. Several experimental runs are carried out using stoichiometric proportion. The reaction has a temperature coefficient value of 2.0. At what temperature should the reaction be carried out if, in spite of halving the concentrations, the rate of reaction is desired to be 50 % higher than in the previous run?

(Given ln6ln2.585)

1. 47 °C                                           

2. 53 °C

3. 57 °C                                           

4. 37 °C

Subtopic:  First Order Reaction Kinetics |
 56%
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When the temperature of a reaction increases from 27 oC to 37 oC, the rate increases by 2.5 times. The activation energy in the temperature range will be:

1. 53.6 kJ                                             

2. 12.61 kJ

3. 7.08 kJ                                             

4. 70.8 kJ

Subtopic:  Arrhenius Equation |
 57%
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For the reaction R-X+OH ROH+X- The rate is given of

Rate=5.0×10-5R-XOH-+0.20×10-5R-X what percentage of R-X Reaction by SN2 mechanism when OH-=1.0×10-2M

1. 96.1%                                                         

2. 3.9%

3. 80%                                                           

4. 20%

Subtopic:  Order, Molecularity and Mechanism |
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